148
16. Servicing Mode
16.1 Expansion Vessel Pre
Pressure Checking
[Upper limit water volume of the system]
The Mono bloc unit has a build-in Expansion Vessel
with 10 L air capacity and initial pressure of 1 bar.
Without antifreeze agent condition
Total amount of water in the system should be below
200 L.
If the total amount of water is more than 200 L, please
add expansion vessel (field supply).
With antifreeze agent condition
In the case of using antifreeze agent, expansion rate ɛ
is different depending on its maker.
Please refer to the antifreeze agent maker for the
expansion rate ɛ before calculate the upper limit water
volume of the system.
The expansion vessel capacity required for the system
can be calculated from the formula below.
[Adjustment of the initial pressure of the expansion
vessel when there is a difference in installation height]
If the height difference between the Mono bloc unit
and the highest point of the system water circuit (H) is
more than 7m, please adjust the initial pressure of the
expansion vessel (Pg) according to the following
formula.
Pg= (H*10+30) kPa
16.2 Maintenance
In order to ensure optimal performance of the unit,
seasonal inspections on the unit, functional check
of RCCB, field wiring and piping have to be
carried out at regular intervals. This maintenance
should be carried out by authorized dealer.
16.2.1 Maintenance for Water Filter Set
1. Remove the Cover by loosening the mounting
screws to access to the Magnetic Water Filter Set.
2. Turn OFF power supply.
3. Set the two valves for the Magnetic Water Filter
Set to “CLOSE”.
4. Take off the clip, then gently pull out the mesh.
Beware of small amount water drain out from it.
5. Clean the mesh with warm water to remove all the
stain. Use soft brush if necessary.
6. Reinstall the mesh to the Magnetic Water Filter
Set and set back the clip on it.
7. Set the two valves for the Magnetic Water Filter
Set to “OPEN”.
8. Turn ON power supply.
9. After cleaning, reinstall the Cover by tightening the
mounting screws properly.
WARNING
Do not add or replace other than R32 type. It may cause
product damage, burst, injury and etc. Use compatible R32
tools for refrigerant piping work and refrigerant charging
during installation or servicing.
V : Req
u
ired g
as
vol
u
me <exp
a
n
s
ion ve
ss
el vol
u
me L>
Vo :
S
y
s
tem tot
a
l w
a
ter vol
u
me <L>
: Exp
a
n
s
ion r
a
te 5
→
60˚C = (depend
s
on
a
ntifreeze
a
gent
us
ed)
P
1
: Exp
a
n
s
ion t
a
nk filling pre
ssu
re = (100) kP
a
P
2
:
S
y
s
tem m
a
xim
u
m pre
ssu
re =
3
00 kP
a
-
( ) Ple
as
e confirm
a
t
a
ct
ua
l pl
a
ce
-
The g
as
vol
u
me of the
s
e
a
led type exp
a
n
s
ion ve
ss
el i
s
pre
s
ented
b
y <V>
It’
s
a
dvi
s
ed to
a
dd 10% m
a
rgin for req
u
ired g
as
vol
u
me of c
a
lc
u
l
a
tion.
V =
x Vo
1 -
9
8
+ P
1
9
8
+ P
2
з
з
Mounting
screws
Cover
Summary of Contents for WH-MXC09J3E5
Page 38: ...38 8 Block Diagram ...
